272 AMPHIGLENA MEDITERRANEA. 
(Claparéde), usually little tapered anteriorly, but distinctly so posteriorly, and ends in a 
bluntly conical or rounded pygidium, which bears four to six pairs of eyes. The segments 
vary from twenty-nine to thirty-three. A pair of spherical statocysts, as mentioned by 
Claparéde, exist in the second segment. They are ciliated internally and have statoliths. 
Claparéde describes a dilatation of the cesophagus in the fourth segment. The circulatory 
system, according to the same author, consists of a contractile ventral vessel and two lateral 
trunks applied to the alimentary canal, but he could not detect the cxecal branches ordinarily 
seen in Sabellids. 
The first achetous segment bears four eyes (in two pairs); and the second segment 
has two statocysts having a number of statoliths, besides two or three minute-winged bristles 
dorsally, and the next seven segments have dorsal tufts of bristles, the upper having narrower 
wings, the lower spatulate from the breadth of the wings, gradations occurring between the 
two, showing a long hair-like continuation of the shaft as well as the broad wigs. The 
dorsal forms (Plate CX X XI, figs. 4 and 4a) have a long shaft shehtly curved backward toward 
the tip, which is finely tapered and furnished with wings of moderate breadth, which insensibly 
disappear below the hair-like tip. The inferior bristles of the same group—that is, those 
next the inferior hook-row—have wings so short and broad as to make the tip spatulate, 
and often with a slender hair-like continuation in the middle (Plate CXXXI, fig. 46). Both 
types of bristles are frequent in the Sabellids. Similar bristles occur on the anterior “ abdo- 
minal” region, but the last six at least are very long, attenuate, and project prominently 
outward, whilst scarcely a trace of a wing is visible even in the most anterior long tuft. 
A series of minute bristles (Plate CX XXI, figs. 4¢ and 4d) with the spatulate tip bent 
at an angle accompany the anterior hooks, which commence on the second bristled segment. 
These occasionally project beyond the line of the main fangs of the hooks a situ. The hooks, 
of which there are about eleven in each row (Plate CXXXI, fig. 4e) have a remarkably 
long main fang with three or four spines in lateral view above it, making a high crown ; 
the posterior outline is much curved and runs to the basal process, whilst the gulf between 
the chief fang and the prow is rather narrow. ‘The posterior process is comparatively long. 
In the posterior hooks (Plate CX XX, fig. 4f) the spikes above the main fang are more numerous 
as well as more evident. The chief fang itself is powerful and slightly curved. The gulf 
anteriorly is as well marked as in the thoracic hooks, but the prow is proportionally broader, 
more blunt, and the posterior process considerably smaller and shorter. The number 
of the hooks anteriorly is similar to that found in the “ thoracic” region, but posteriorly 
they diminish, so that in the antepenultimate row there may be only one. The change in 
the setigerous and uncinigerous processes occurs at the tenth segment, the posterior region 
having the hooks dorsal and the bristles ventral. 
Reproduction.—Claparéde first noticed the hermaphrodite condition of this species, 
ova and sperms occurring in the ccelom, and he gave an account with sizes of both ova and 
sperms. He describes the dorsal pore by which the common duct of the ciliated segmental 
organs opens behind the branchie. Lo Bianco (1909) gives February to May as the period 
of sexual maturity at Naples. De St. Joseph also alludes to the large red eggs (0°27 mm. 
in diam.) in an example of forty segments, occupying, to the number of sixteen, the first 
ten abdominal segments, and the sperms the last nineteen. He figures (1906) the sperms 
as short bodies with an elliptical head.. 7 
